Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7647a9065673913…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 09:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9c144ab003ef8beb14dd1d56428cd67 SHA-1: 4285394dcb8bec554b73a92dc0f7411e3bdc7b35 SHA-256: c7647a9065673913a7f988d63740d7e5cb91f2dd40ffc89914f262a3fdcb2bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=paris+convention+treaty+pdf PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121659fb1b3c---dezunatozotuxim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89e38be8c---13813069096.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/pebisipazupot.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90102a4e19---29778573691.pdfIn PDF document text
    • http://thegioioto.store/upload/files/jakirewimukil.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210726080116.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ced47ee01---91895190900.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608704b3754f2---43524694554.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/13994154213.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c6c3ed61---guluzatazalosuzowusiju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e1ffb5c2206a3a231a28dd107b0d3e68/ginudatobijizelepominu.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/68017440531.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/11144316017.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151157469500.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/wejabijefejeluja.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6e335f73ba7b6500614108826c89c469/fejozefed.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6afc80451c5341ba2ca70771ed7e1e3d/jugekonomujivunitipuluz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/df3f7743be8d3fc4314a7fb12f4b0209/51063634582.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fff881dc---dokoxixitowiziwelidukofi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a2e28985a074bb9d4147b5553fa54edc/18515476422.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/auhcjkiaumhr6ig7mlbifpc74i/50253464230.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6d7d7c2cc6e45a2909682096e2cd48ee/92167306276.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 10748 bytes
SHA-256: 5c71cef8394912409d9ec7d16e29217261dd04518bbe9e27b84ef008f58a7619
font_02_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 19904 bytes
SHA-256: 2035e6c299734a18cebc74212ee9b4336c52df7d35d03a68f330073214a73246

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